Examine source code of RedirectionRedirector

{
  "manifest_version": 2,
  "name": "Redirector",
  "version": "1.0",
  "description": "Redirect specified domains to other domains",
  "permissions": [
    "storage",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3720ea3c-b7af-4e1f-9071-79fdc288f599}"
    }
  }
}